<template>
	<div>
		<!-- 面包屑头部 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
		  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
		  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
		  <el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>
		
		<!-- 卡片视图 -->
		<el-card>
			<!-- 提示区 -->
			 <el-alert
			    title="添加商品信息"
			    type="info"
			    center
			    show-icon
				:closable="false"
				>
			  </el-alert>
			  <!-- 步骤条 -->
			  <el-steps align-center :space="200" :active="activeIndex -0" finish-status="success">
			    <el-step title="基本信息"></el-step>
			    <el-step title="商品参数"></el-step>
			    <el-step title="商品属性"></el-step>
			    <el-step title="商品图片"></el-step>
			    <el-step title="商品内容"></el-step>
			    <el-step title="完成"></el-step>
			  </el-steps>
			  
			  <!-- tab拦区域 -->
			  <el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">		  
			   <el-tabs @tab-click='tabClicked'  :before-leave='beforeTabLeave' v-model="activeIndex" :tab-position="'left'" >
			    <!-- 基本信息 -->
				  <el-tab-pane name='0' label="基本信息">
					<el-form-item label="商品名称" prop="goods_name">
					   <el-input v-model="addForm.goods_name"></el-input>
					 </el-form-item>
					 <el-form-item label="商品价格" prop="goods_price">
					    <el-input v-model="addForm.goods_price"></el-input>
					  </el-form-item>
					  <el-form-item label="商品数量" prop="goods_number">
					     <el-input v-model="addForm.goods_number"></el-input>
					   </el-form-item>
					   <el-form-item label="商品重量" prop="goods_weight">
					      <el-input v-model="addForm.goods_weight"></el-input>
					    </el-form-item>
						<el-form-item label="商品分类" prop="goods_cat">
							 <el-cascader
							 expand-trigger="hover"
							    v-model="addForm.goods_cat"
							    :options="catelist"
							    :props="cateProps"
							    @change="handleChange"></el-cascader>
						</el-form-item>
				  </el-tab-pane>
				  <!-- 商品参数 -->
			      <el-tab-pane name='1' label="商品参数">
					  <!-- 渲染表单的item项 -->
					  <el-form-item v-for="item in manyTabData" :key='item.attr_id' :label="item.attr_name">
						   <el-checkbox-group v-model="item.attr_vals">
						     <el-checkbox v-for="(cb,i) in item.attr_vals" :key='i' :label="cb" border></el-checkbox>
						   </el-checkbox-group> 
					  </el-form-item>
				  </el-tab-pane>
			      <el-tab-pane name='2' label="商品属性">					  
						  <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key='item.attr_id'>
							 <el-input v-model="item.attr_vals"></el-input> 
						  </el-form-item>
				  </el-tab-pane>
				  <!-- 商品图片 -->
			      <el-tab-pane name='3' label="商品图片">
					  <el-upload
					  :headers='headerObj'
					    :action="uploadURL"
					    :on-preview="handlePreview"
					    :on-remove="handleRemove"
						:on-success="handleSuccess"
					    list-type="picture">
					    <el-button size="small" type="primary">点击上传</el-button>
					  </el-upload>
				  </el-tab-pane>
				  <!-- 商品内容 -->
			      <el-tab-pane name='4' label="商品内容">
					  <!-- 富文本编辑器 -->
					  <quill-editor
					  v-model='addForm.goods_introduce'
					  ></quill-editor>
					<!-- 添加商品按钮 -->
					<el-button class="btnAdd" @click='add' type='primary'>添加商品</el-button>
				  </el-tab-pane>
			    </el-tabs>
				</el-form>
		</el-card>
		<!-- 图片预览 -->
		<el-dialog
		  title="图片预览"
		  :visible.sync="previewVisible"
		  width="50%"
		  >
		  <img :src="previewPath" class="previewimg"/>
		</el-dialog>
	</div>
</template>

<script>
	import _ from 'lodash'
	export default{
		data() {
			return{
				activeIndex:'0',
				// 添加商品表单数据对象
				addForm:{
					goods_name:'',
					goods_price:0,
					goods_number:0,
					goods_weight:0,
					goods_introduce:'',				
					// 商品所属分类数组
					goods_cat:[],
					// 图片信息数组
					pics:[],
					// 商品介绍
					goods_introduce:'',
					attrs:[],
				},
				addFormRules:{
				goods_name:[
					{required:true, message:'请输入商品名称', trigger:'blur'}
				],	
				goods_price:[
					{required:true, message:'请输入商品价格', trigger:'blur'}
				],
				goods_number:[
					{required:true, message:'请输入商品数量', trigger:'blur'}
				],
				goods_weight:[
					{required:true, message:'请输入商品重量', trigger:'blur'}
				],
				goods_cat:[
					{required:true, message:'请输入商品重量', trigger:'blur'}
				],
				},
				// 商品分类列表
				catelist:[],
				// 级联选择器配置对象
				cateProps:{
					label:'cat_name',
					value:'cat_id',
					children:'children'
				},
				// 动态参数列表数组
				manyTabData:{},
				// 静态参数列表数组
				onlyTabData:{},
				// 上传图片地址
				uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
				// 图片上传组件的headers请求头对象
				headerObj:{
					Authorization: window.sessionStorage.getItem('token')
				},
				previewPath:'',
				// 图片预览对话框显示与隐藏
				previewVisible:false,
				
			}
		},
		created() {
			this.getCateList()
		},
		methods:{
			// 获取所有商品分类数据
			async getCateList(){
				const {data: res} = await this.$http.get('categories')
				if(res.meta.status !==200){
					this.$message.error('获取商品数据失败！')
				}
				this.catelist = res.data
				// console.log(this.catelist)
			},
			// 级联选择器变化触发
			handleChange(){
				// console.log(this.addForm)
				if(this.addForm.goods_cat.length !==3){
					this.addForm.goods_cat.length = []
				}
			},
			// 监听tab拦切换
			beforeTabLeave(avtiveName,oldActiveName){
			if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
				this.$Message.error('请先选择商品分类！')
				return false
			}
			},
			// tab拦点击事件
			async tabClicked(){
				// 证明访问的是动态参数面板
				if(this.activeIndex === '1'){
					const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
				// console.log(res)
				if(res.meta.status !==200){
					this.$message.error('获取参数失败！')
				}
				res.data.forEach(item =>{
					item.attr_vals = item.attr_vals.length === 0 ?[] : item.attr_vals.split(' ')
				})
				this.manyTabData = res.data
				// console.log(res)
				}else if(this.activeIndex === '2'){
					// 判断是否为商品属性面板
					const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
				if(res.meta.status !==200){
					return this.$message.error('获取静态属性失败！')
				}
				this.onlyTabData = res.data
				}	
			},
			// 监听图片上传成功的事件
			handleSuccess(response){
				// 1:拼接得到一个图片信息对象
				const picInfo = {pic: response.data.tmp_path}
				// 2:将对象信息,push到pics数组中
				this.addForm.pics.push(picInfo)
				// console.log(this.addForm)
			},
			// 点击图片预览的效果
			handlePreview(file){
				// console.log(file)
				this.previewVisible = true
				this.previewPath = file.response.data.url
			},
			// 处理移除图片的操作
			handleRemove(file){
				// console.log(file)
				//1获取将要删掉图片的临时路径
				const filePath = file.response.data.tmp_path
				// 2:从pics数组中，找到这个图片对应的索引
				const i = this.addForm.pics.findIndex(x =>{
					x.pic === filePath
				})
				// 3：调用书中的splice方法，把图片信息对象，从pics数组中移除
			this.addForm.pics.splice(i,1)	
			// console.log(this.addForm)
			},
			// 添加按钮
			 add(){
				this.$refs.addFormRef.validate(async valid =>{
					if(!valid){
						return this.$message.error('请填写必要的表单项！')
					}
					// 执行添加业务逻辑
					// lodash   cloneDeep(obj) 深拷贝
					// _ 为上方lodash定义
					const form = _.cloneDeep(this.addForm)
					form.goods_cat = form.goods_cat.join(',')
					// 处理动态参数和静态属性
					// 动态
					this.manyTabData.forEach(item =>{
						const newInfo = {attr_id:item.attr_id, attr_value:item.attr_vals.join(' ')}
						this.addForm.attrs.push(newInfo)
					})
					// 静态
					this.onlyTabData.forEach(item =>{
						const newInfo = {attr_id:item.attr_id, attr_value:item.attr_vals}
						this.addForm.attrs.push(newInfo)
					})
					form.attrs = this.addForm.attrs
					// console.log(form)
					
					// 发起请求添加商品
					// 商品名称必须是唯一的
					const {data:res} = await this.$http.post('goods',form)
					// console.log(res)
					if(res.meta.status !== 201){
						return this.$message.error('添加商品失败！')
					}
					this.$message.success('添加商品成功！')
					this.$router.push('/goods')
				})
			},
			
		},
		computed:{
			cateId(){
				if(this.addForm.goods_cat.length ===3){
					return this.addForm.goods_cat[2]
				}
				return null
			}
		}
	}
</script>

<style scoped="scoped" lang="less">
	.el-checkbox{
		margin: 0 10px 0 0 !important;
	}
	.previewimg{
		width: 100%;
	}
	.btnAdd{
		margin-top: 15px;
	}
</style>
